Knot-tying implement.



Patented Aug. 26, I902. H. D. COLMAN.

KNUT TYING IMPLEMENT. (Application filed 00$. 23, 1900.

6 Sheets-Sheet I.

(No Model.)

(Application filed Oct. 23, 1900.)

(No Model.)

No. 707,826. Patented Aug. 26, I902.

H. D. COLMAN.

KNOT TYING IMPLEMENT.

(Application filed Oct. 23, 1900.)

6 Sheets-Sheet 4.

(No Model.)

Patented Aug. 26, I902.

H. D. COLMAN.

KNOT TYING IMPLEMENT.

(Applicatibn filed Oct. 23, 1900.)

-6 Shets-Shest 5.

(No Model.)

No. 707,826. Patented Aug. 26, I902.

H. D. COLMAN.

KNOT TYING IMPLEMENT.

. (Application flied Oct. 23, 1900.) (No Model.) 6 Sheets-Sheet 6.

? 2 .ZZr'uzlfi read W I LYQ LWL gag 1 TTED STATES PATENT OFFICE.

HOWARD D. COLMAN, OF ROCKFORD, ILLINOISH KNOT-TYING IMPLEMENT.

SPECIFICATION forming part of Letters Patent N 0. 707,826, dated August 26, 1902.

Application filed October 28, 1900. Serial No. 34,069- (No model.)

To all whom it may concern:

Be it known that I, HOWARD D. COLMAN, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Knot-Tying Implements, of which the following is a specification.

The object of this invention is the production of a hand-operated implement adapted to tie that form of knot known as the weavers knot.

In the embodiment herein shown of this invention the tying mechanism is intended to be worn constantly on the left hand of the operator and its parts to be actuated bya pivoted lever adapted to be engaged by the thumb of said hand. thread is wound helically about a bifurcated spindle by the rotation of the latter, and the necessary loops of the knot are formed in said thread by a tumbler-finger passing through the bifurcation of the winding-spindle and turning a somersault as it passes. At the end of its movement this tumbler-finger stands with the first thread looped over its end and with a jaw open to receive the second thread of the knot, which the next and final movement of the mechanism causes it to shear off and clamp, after which the knot is stripped from the winding-spindle of the implement by the rotation of the spool on the spooling mechanism. It will thus be seen that the loops necessary for the production of the knot are formed in one thread and pulled over the second thread while the latter is heldby the mechanism.

In the accompanying drawings, Figure 1 is a side elevation of a knot-tying implement embodying the features of my invention. Its parts are represented to be in the first or normal position, ready to receive the first thread in forming the knot. Fig.2 is an enlarged front elevation of said mechanism looking in the direction of the arrow 2 in Fig. 1, the parts remaining in the normalposition. Fig. 3 is a top plan view of the implement, its parts beingin the normal position. Fig. t is a vertical section through the mechanism on dotted line 4 4 of Fig. 2 looking in the direction of the arrow, the thumb-lever, however, having been depressed through its full move- In said operation the first ment and the mechanism moved accordingly. This position is hereinafter designated as the third position of the mechanism. Fig. 5 is a vertical section on dotted line 5 5 of Fig. 2 looking in the direction of the arrow. Fig. 6 isa vertical section on dotted line 6 6 of Fig. 3, the mechanism being in a position incident to the depression of the thumb-lever through about one-half its movement, hereinafter designated as the second position of the mechanism. Fig. 7 is a section on dotted line 7 7 of Fig. 2 looking in the direction of the arrow, the thumb-lever having been depressed slightly to move the tension-arm D which latter is represented in its lowest position. Fig. 8 is a central section through the bifurcated winding-spindle on dotted line 8 S of Fig. 6. Fig. 9 is a side elevation of said winding-spindle as shown in Fig. 8 looking in the direction of the arrow in said Fig. 8. Fig. 10 is a side elevation of the tumblerfinger and its immediate connections, said finger being represented as in the third position. Fig. 11 is a perspective view of the knot-forming mechanism in its first ornormal position, showing the first thread placed in position to be acted upon. Fig. 12 is a similar View of the same parts after said thread has been cut off and clamped by the shearing and clamping jaw of the winding-spindle and said spindle has made a quarter-revolution. Fig. 13 is a similar view of said mechanism ..in the second position, showing the windingspindle at rest after having been rotated one and one-quarter revolutions from the first position, also showing the tumbler-finger as en- T tering the bifurcation of said Winding-spindle between the loops of the thread wound thereon. Fig. 14 is a similar View showing the parts of'the mechanism in the third positionto wit, the relative positions assumed by the mechanism at the end of the downward movement of the thumb-lever, the to mbier-finger having passedthrough the bifurcation of the winding-spindle, turninga complete somersault therein, looping the thread wound about said spindle, and drawing said loop outward and retaining it on the end of said finger. The shearing and clamping'jaw of said finger stands open in this position of the mechanism ready to receive the second thread, which is represented in this figure as ICO being in place in said jaw. Fig. shows the mechanism after the next movement-to wit, an upward movement of the thumb-lever, which causes the shearing and clamping jaw of the tumbler-finger to shear and clamp the second thread. This is the fourth and final position of the mechanism, after which the knot is ready to be drawn from the windingspindle. This latter may be accomplished by grasping the end of the first thread in the right hand and drawing upward thereon, but in practice is done by releasing the windingspool of the warping mechanism to action. Fig. 16 represents the withdrawal of the knot from said winding-spindle. Fig.17 shows the knot formed, the ends of the thread still being retained in the clamping-jaws of the winding-spindle and the tumbler;finger. Fig. 18 illustrates the Weavers knot, showing the direction and position of the threads as the knot is formed by the mechanism and before the loops of said knot are tightened. 19 is a view of a weavers knot, illustrating the relative positions of the loops and the direction of the threads when the knot is drawn tight.

Like letters of reference indicate corresponding parts throughout the several views.

To assist in a ready comprehension of this knot-tier, the mechanism may be said to assume four principal positions, to wit:

The first or normal position. (Illustrated in Figs. 1, 2, 3, 5, and 11.)

The second position,wherein the first thread has been helically wound upon the windingspindle and said spindle stands ready for the passage of the tumbler-finger through its bifurcated end, as indicated in Figs. 6, 8, 9, and 13.

The third position, wherein the tumbler-finger has passed through the bifurcated end of the winding-spindle and stands with the first thread looped over its free end and with its shearing and clam ping jaw open to receive the second thread. In this position the thumb-lever is depressed to its lowest point. The third position is indicated in Figs. 4, 10, and 14.

The fourth and "final position, which differs from the third only in that the shearing and clamping jaw of the tumbler-finger has been closed, cutting otf'the second thread and clamping the short end thus made and said.

finger moved back toward the winding-spindle in position to permit the formed knot to be stripped from the mechanism and tightened. The fourth position is indicated in Figs. 15, 16, and 17. p

The thread first presented to the mechanism to be wound about the'winding-spindle and looped by the tumbler-finger may be designated as the first thread, and the threadplaced in the open jaw of the tumblerfi'nger when the mechanism is in the third position may be called the second thread. In the operation of the implement the winding-spindle mechanism is first actuated, it

, finishing its work and coming to rest before Fig.

ripheral surface.

frame A. Just above the sleeve A the frame A assumes a rectangular outline, and the upper end of the frame is provided with a guidearm A for the thread first presented to the mechanism, also with acurved guide-wire A for directing the second thread when the latter is presented to the mechanism. Said frame hasa shoulder A for a purpose to be hereinafter mentioned.

A winding-spindle B is rotatably mounted in the framework A. The upper end of this spindle is bifurcated, comprising the two fingers B and B having between them the opening B The finger B has a longitudinal slot 3*, provided with a fixed shearing-jaw B This slot B also contains a pivoted shearingjaw B adapted to shear with one of its forward edges and to clamp with its other for ward edge, said jaw being free to move in the space between the fixed shearing-jaw B and the side of said longitudinal slot B, so that a thread placed in said pivotal jaw B when opened will by the closing thereof be cut off between said shearing-jaws B and B and clamped between the jaw B and the side of the longitudinal slot B". The shearing and clamping jaw B has an integral extension B rearward of its supporting-pivot, and this extension is provided with an elongated opening B intended to be engaged bya pin adapted to operate said jaw B, as will be later described herein. The portion of the windingspindle located between its bearings in the rectangular portion of the supporting-frame has a spiralcam-groove B formed in its pe- A collar B surrounds said spindle and is provided with a pin B for entering said cam-groove B", by which connection said collar is raised or lowered-when said spindle is rotated. A guide-rod B lies parallel with said winding-spindle in suitable bearings in the rectangular portion of the frame A and is capable of a longitudinal movement in said bearings. The upper end of this guide-rod is bent in U form to receive the thread intended to be wound around the spindle B by the rotation of the latter. The lower end of the guide-rod B is fixed with relation to the collar B and, as will be seen, a rotation of the spindle B will produce a longitudinal movement of the guide-rod B whereby the first thread is fed onto said spindle helically as the latter is rotated. B is a pinion, and B a delay-shoe, both fixed on the winding-spindle B. A curved guide B is secured to the rectangular portion of the frame A in such a position that the upper edge of said guide will enter the elongated opening 13 in the rear end of said shearing and clamping jaw B when the windingspindle is rotated in order to hold said jaw in a closed position.

A shaft 0 is journaled within the sleeve A of the supporting -frame A and has fixed thereon the'blind sector-gear 0, having the teeth G ,adapted to mesh with those of the pinion B ,also having two delay-flanges C and 0 adapted to be contacted by the delay-shoe B of the winding-spindle B. This sectorgear 0 has pivoted to its side a locking-lever C the rear end of said lever being held elevated by the spring C in order to cause the rear end of said lever to engage the shoulder A of the supporting-frame A to stop the parts of the mechanism in the fourth position. The sector-gear G is also provided with a pin 0 adapted to enter the elongated opening B of the shearing and clamping jaw B and when the mechanism is in the first or normal position to open said shearing and clamping jaw, closing said jaw at the beginning of the operation of the mechanism. The sectorgear 0 is also provided with a stud C the purpose of which will be hereinafter mentioned.

D is a thumb-lever forked at its forward end to receive the thumb of the operator. Its rear end is in clamp form, surrounding and frictionally engaging the hub D of the sector-cam D This cam is provided with an elongated opening D adapted to receive the stud (J of the sector-gear O. The hub D is mounted loosely upon the shaft 0, whereby it will be seen that the thumb-lever and sector-cam being fixed together have a slight oscillatory movement with relation to. the sector-gear O. The peripheral face of said sector D is in cam form. At its forward end it has a pocket D" and at its rear end a sudden declivity D, the peripheral surface D of the cam gradually descending toward its rotatable center from said pocket D to the crest of said declivity D A tension-arm D for the first thread has a pivotal connection with the upright portion of the supporting-frame A. Its free'end is held upraised by; a coil-spring D but its movement is governed by a roller-stud D riding upon the peripheral surface of the sector-cam D When the thumb-lever D is in its upraised position incident to the first position of the mechanism, the roller-stud D of the tensionlever lies in the pocket D of the sector-cam D A downward movement of said thumblever, producing an upward movement of the sector-cam D moves said roller-stud D in said pocket D and causes a considerable downward movement of the forward end of the tension-arm D This position is illustrated in Fig. '7 of the drawings. A continued downward movement of the thumb-lever carries the roller-stud out of the pocket and into contact with the peripheral cam-surface D of the sector-cam D This cam-surface permits a slow upward movement of the tension-lever D (to yield the thread to the rotating winding-spindle 13,) and as soon as the roller-stud D reaches the declivity D of the sector-cam D the forward end of the tensionlever is permitted to rise rapidly.

A sector-frame E is rigidly secured by the clamp E to the outer end of the sleeve A 5of the frame A. This sector is provided with the gear-teeth E and the peripheral delaysurface E On the outer end of the shaft 0, adjacent to said sector E, an arm F is fixed. The free end of this arm is provided with the frame F and has rotatably mounted therein the shaft F with the pinion l5 and the delay-shoe F fixed on said shaft. The teeth of the pinion F are adapted to mesh withthe gear-teeth E and the delay-shoe E to slide in contact with the peripheral delay-surface E of the sector E.

The tumbler-finger G and its integral supporting-arm G form a yoke of rectangular form, and said arm is provided with a hub G and is affixed by said hubto the end of the shaft F The tumbler-fingerG has a shearing-jaw G fixed on its inner side at a little distance from said finger in order to leave room between said fixed shearing-jaw G and said finger for the shearing and clamping jaw G pivoted to said fixed jaw G This pivoted shearing and clamping jaw G like the tumbler-finger, is, with its integral supporting-arm G substantially of rectangular yoke form. The arm G of said shearing and clamping jaw has an elongated opening G at its rotatable center, through which the shaft 15 passes, and at one side of its said central opening G is provided with a stud G ,adapted to engage a circular channel Gfiformed in the frame F. This circular channel G is provided with an outwardly-extending pocket G, into which the stud Gr passes when the shearing and clamping jaw G opens on its pivot, and to throw said stud G into said pocket G and cause said jaw G to open I provide a pivotal connection between the hub G and the arm G of the shearing and clamping jaw G com prising the pin G which enters an opening in said arm. The purpose of this channel G is to prevent the opening of the shearing and clamping jaw G except in the third position of the mechanism, when the stud G enters the pocket G In use the implement hereinbefore described is worn upon theleft hand of the operator. When the ends of two threads are to be tied together, the parts of the mechanism are thrown into the first or normal position. One of said threads is grasped by the right hand of the operator and laid in the groove of the guide-arm A in the U depression in the upper end of the guide-rod B and into the open shearing and clamping jaw B of the windingspindle B. A slight downward movement of the thumb-lever D rocks the sector-cam upon the shaft 0 through the length of the elongated opening D and depresses the tensionarm D (see Fig. 7,) the latterby its downward at the first part of the downward movement of the thumb-lever D. A continued depression of said thumb-lever D oscillates the shaft and the sector-gear O, fixed on said shaft. In the normal position of the mechanism the delay-shoe D of the winding-spindle lies in contact with the delay-flange O of the sectorgear 0, and the pin 0 lies in the opening B of the shearing and clamping jaw B, holding said jaw open. As soon as said sector-cam D has been oscillated through the length of the elongated opening D and the sector-gear O is given movement the pin 0 moving away from the winding-spindle l3 rocks the shearing and clamping jaw on its pivot, closing said jaw and shearing and clamping said first thread. The instant this is accomplished the gear-teeth G of the sector-gear Oengage the teeth of the pinion D and the Winding-spindle is rotated. With the rotation of the spindle the tension-arm D rises slowly to give suflicient slack thread to'the winding-spindle, and the guide-rod B is caused to move downward by reason of its collar-and-pin engagement with the cam-groove B in the windingspindle B in order to direct the thread helically upon the upper end of said spindle. The gear-teeth (3 of the sector-gear C are sufliciently numerous to rotate the windingspindle B through one and one-fourth revolutions, said spindle coming to rest with its delay-shoe D in contact with the delay-flange C of the sector-gear C, with the elongated opening 13 of the shearing and clamping jaw B in engagement with the curved guide B and its opening B properly disposed to permit the passage of the tumbler-finger G therethrough. The tumbler-finger G, which-by reason of its arm connection with the shaft 0 has been caused to approach the windingspindle, now enters, point first, the opening 13 in the upper end of said spindle, passing over the strand of thread on the near side of said spindle and between the two strands on the opposite side of the spindle. At this moment and while the tumbler-fin er G is within said opening B the pinion 3 engages the teeth E of the sector-frame E and the tumbler-finger turns a forward somersault, emerging from the opening B in an inverted position, holding the portion of the thread last wound upon the spindle looped over the end of the finger, having pulled said thread through the upper loop formed by Winding the thread about the upper end of said spindle. During the somersaultof the tumbler-finger G the shearing and clamping jaw G thereof is held closed by the stud G sliding in the circular channel G but ata point near the end of the movement of the tumbler-finger said stud passes into the pocket G", and the slight further movement of the tumbler-finger G opens the shearing and clamping jaw G by reason of the pivotal connection (the pin G between the hub G2 and the arm G of said shearing and clamping jaw G. This places the =mechanism in the third position (illustrated in Fig. 14 of the drawings) ready to receive the second thread,which is drawn into the open shearing and clamping jaw G of the tumbler-finger G, said thread being guided to said jaw by the curved guidewire A. WVhenthe second thread is in place in said jaw G, the thumb-lever D is raised slightly until the rear end of the locking-lever C engages the shoulder A of the supporting-frame A. This movement of the thumb-lever I) closes the shearing and clamping jaw Gflcutting off and clamping the second thread and placing the mechanism in the fourth and final position, as shown in Figs. 15,16,and 17 of the drawings. The knot formed upon the winding-spindle B and the tumbler-finger G is now ready to be pulled off and tightened, which is done by stripping the first thread upward from the mechanism. The knot is tightened as the short ends of the two threads are pulled from the two clamping and shearing jaws B and G The forward end of the locking-lever 0 extends to a point near the thumb-lever I), and the thumb of the operator raises said locking-lever without being removed from the thumb-lever when it is desirable to restore the mechanism to the normal position.

I claim as my invention 1. In a knot-tying implement, in combination, means for forming a loop in a thread; which means comprises a rotatable windingspindle; means for passing a bight of said thread through said loop; and means for introducing a second thread into said bight.

2. In a knot-tying implement, in combination, means for forming a loop in a thread; which means comprises a rotatable Windingspindle; means for passing a bight of said thread through said loop; and means for holding a second thread in such position that the bight thus formed may be pulled over said second thread.

3. In a knot-tying implement, in combination, means for looping a thread in helical form; which means comprises a rotatable winding-spindle and a movable thread-guide;

means for passing a bight from one of the windings of the helix inwardly through the central loop of the latter; and means for introducing a second thread into said bight.

4:. In a knot-tying implement, in combination,mechanism for forming a loop in a thread; which mechanism comprises a rotatable bifurcated winding-spindle; means for passing a bight of the thread through the formed loop; and means for introducing a second thread into said bight.

5. In a knot-tying implement, in combination, a winding-spindle for forming a loop in a thread; a shearing and clamping jaw pivotally mounted on said spindle; means for passing a bight of said thread through the formed loop; and means for introducing a second thread into said bight.

6. In a knot-tyingimplement, in combination, a winding-spindle having an opening therein; a shearing and clamping jaw pivot ally mounted on said spindle; means for rotating said spindle and winding a thread thereon; means adapted to pass through the opening in said spindle, for passing a bight of said thread through the loop formed by winding it about said spindle; and means for holding a second thread in such position that the bight thus formed may be pulled over said second thread.

7. In a knot-tying implement, in combination, a winding-spindle having an opening therein, also having a shearing and clamping jaw; means for rotating said spindle and winding a thread thereon; means adapted to pass through the opening insaid spindle, for passing a bight of said thread through the loop formed by winding said thread about the spindle; and a shearing and clamping jaw for holding a second thread in such position that the bight thus formed may be pulled over said second thread.

S. In a knot-tying implement, in combination, means for forming a loop in a thread; which means comprises a rotatable windingspindle having a shearing and clamping jaw; a finger adapted to pass a bight of said thread through said loop; and means for introducing a second thread into said bight.

9. In a knot-tying implement, in combination, means for forming a loop in a thread, said means comprising a shearing and clamping jaw; a tumbler-finger adapted to pass a bight of said thread through said loop; and means for introducing a second thread into said bight.

10. In a knot-tying implement, in combination, means for forming a loop in a thread, said means comprising a shearing and clamping jaw; a tumbler-finger adapted to pass a bight of said thread through said loop; and means for holding a second thread in such position that the bight thus formed may be pulled over said second thread.

11. In a knot-tying implement, in combination, means for forming a loop in a thread, said means comprising a shearing and clamping jaw; a tumbler-finger adapted to pass a bight of said thread through said loop; and a clamping-jaw for holding a second thread in such position that the bight thus formed may be pulled over said second thread.

12. In a knot-tying implement, in combination, means for forming a loop in a thread; a tumbler-finger adapted to pass a bight of said thread through said loop; and a shear in g and clamping jaw on said tumbler-finger, for cutting off a second thread, and for holding it in such position that said bight may be pulled over said second thread.

13. In a knot-tying implement, in combination, a winding-spindle having an opening therein; means for rotating said winding-spindle; a tu mbler-finger adapted to pass through the opening in said winding-spindle; means for turning said tumbler-finger; and-means for holding a second thread adjacent to said winding-spindle.

14. In a knot-tying implement, in combination, a winding-spindle having an opening therein; a shearing and clamping jaw on said spindle; means for rotating said spindle; a tumbler-finger adapted to pass through the opening in said spindle; means for turning said tumbler-finger; and a shearing and clamp ing jaw on said finger.

15. In a knot-tying implement, in combination, a winding-spindle having an'opening therein; a shearing and clamping jaw on said spindle; a thread-guide adapted to have a longitudinal movement with relation to said spindle while the same is being rotated; a

tumbler-finger adapted to pass through the 7 opening in said spindle; means for turning said tumbler-finger; and ashearing and clamping jaw on said tumbler-finger.

16. In a knot-tying implement, in combination, a winding-spindle having an opening therein; a shearing and clamping jaw on said spindle; a thread-guide adapted to have a longitudinal movement with relation to said spindle during the rotation of the latter; a tension-arm; a tumbler-finger adapted to pass through the opening in said spindle; a gear for turning said tumbler-finger; and a shearing and clamping jaw on said finger.

17. In a knot-tying implement, in combination, a winding-spindle having an opening therein; a shearing and clamping jaw on said spindle; intermeshing gear for rotating said spindle; said spindle also having a camgroove; a thread-guide adapted to be actuated by said grooved cam; a tension-arm; a cam for actuating said tension-arm; a tumbler-finger adapted to pass through said opening in said spindle; a gear for turning said tumbler-finger; and ashearing and clamping jaw on said finger.

18. In a knot-tying implement, in combination, a winding-spindle having an opening therein, and a cam-groove; a shearing and clamping jaw on said spindle; a pinion and a delay-shoe for the spindle; a sector-gear; gear-teeth and two delay-flanges on said sector; a thread-guide adapted to be actuated by said grooved cam; a tumbler-finger adapted to pass through the openingin said spindle; means for turning said tumbler-finger; and a shearing and clamping jaw on said finger.

19. In a knot-tying implement, in combination, a winding-spindle having-an opening therein; a shearingand clamping jaw on said spindle; said spindle also having a pinion and a delay-shoe thereon, and a cam-groove therein; a guide-arm for the thread, adapted to be moved by said grooved cam; a sectorgear having gear-teeth for said pinion, and two delay-flanges for said delay-shoe; a tension-arm; a cam for actuating said tensionarm; a thumb-lever for moving said sector and said cam; a projection on the sector-gear for opening andclosing the shearing and clamping jaw; a tumbler-finger adapted to pass through the opening in said spindle; means for turning said tumbler-finger; and a shearing and clamping jaw on said finger.

20. In a knot-tying implement, in combination, a winding-spindle having an opening therein and a cam-groove; said spindle also having a pinion, a delay-shoe, and a shearing and clamping jaw; a fixed guide for holding said shearing and clamping jaw closed; a sector-gear having gear-teeth for said pinion and two delayflanges for said delay-shoe, also having a projection for opening and closing said shearing and clamping jaw; a shaft for said sector-gear a sector-cam loosely mounted on said shaft, but movably connected with said gear-sector a tension-arm adapted to be actuated by said sector-cam; a thread-guide adapted to be moved by the grooved cam of said winding-spindle; a thumb-lever having a rigid connection with said cam-sector; a tumbler-finger adapted to pass through the opening in said spindle; means for turning said tumbler -finger; and a shearing and clamping jaw on said finger.

21. In a knot-tying implement, in combination, a Winding-spindle havingnan opening romeo.

therein; means for rotating said spindle; a tumbler-finger adapted to pass through the opening in said spindle; a supporting-shaft for said tumbler-finger; a pinion and a delayshoe on said shaft; a fixed sector having gearteeth for said pinion, and a peripheral delaysurface for said delay-shoe; and a shearing and clamping jaw for said tumbler-finger.

22. -In a knot-tying implement, in combination, a Winding-spindle having an opening therein; means for rotating said spindle; a shaft; a thumb-lever on said shaft; an arm fixed with relation to said shaft; a frame on said arm; a tumbler-finger adapted to pass through the opening in said spindle; a shaft for said tumbler-finger; said frame being provided with a channel concentric with the bearing for said tumbler-finger, said channel having a pocket near its end; a pinion and a delay-shoe on said tumbler-finger shaft; a fixed sector having gear-teeth for said pinion and a peripheral delay-surface for said delayshoe; a shearing and clamping jaw havinga pivotal connection with said tumbler-finger, also having an integral arm; a stud on said arm, adapted to engage the concentric channel in said frame; and a pivotal engagement between said tumbler-finger and said arm, whereby the stud on said arm is thrown into the pocket in said channel to open said shearing and clamping jaw.

HOWARD D. COLMAN. Witnesses:

W. A. BARBER, W. JOSEPH DOYLE. 

